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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db522aa796f9f76eb03f5b10e7db8b66ef08e33875075fdcfb7a5dda509a4d45' 
  AND token = '0oq0bu5wvwkmgxKDWetNTCbC1XzR3Vx3fkLXNc5BDfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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