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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bc8d08b36b49124ed468937011d5a62940c97f961f1229e4d25bccb7ee88168' 
  AND token = '3Lbt1KGWZqCjRna48o2qwIoPY3ygVpzDGqyrbxd6nb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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