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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b9bedcbb541203e6beab2164e9e81a9eb9c6211bfa890df39bd1f5615a6e312' 
  AND token = 'ljXdltVb5Ksmoc60EFt8Ncpb7J/NU7SzSLrVFVl4bsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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