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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7471b901e45be482244a02015691e7a3679451fd51a2befe55a24d6dd805747' 
  AND token = 'gOnQDKl/LW5rG8RWgRd8iexGrYl1Jwap+NeumeP3T2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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