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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27b6135b6ffc03b98956bf0dc805f1a23ec2d5858f4aff813ad48b71807b3414' 
  AND token = 'uN42Dl2SHjSDgTcz5SV4O5uGQnC7iBubTnroTEzll3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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