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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '660f8484b39e7064885e038e81f718e44b8ddbabc9a01bcfbfe00c20155b2b21' 
  AND token = 'mlV4yA6iu5QUAITbyCu7Qjl6Iukz1X7DS91D8SqREnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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