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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d4415114e8842dd83ce4ac7ee38f658775cd04c6955d78274d13a3bfde1943' 
  AND token = 'F17luATZ5BWuv9o/HNL2A5w31iUUMYlbQbeuXWPlYh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}