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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e7a8bbc67d0e70dcf2573bac9bb74b6df6d37d65f1b7a515060ae850f57c66' 
  AND token = 'YcwF89K2O/iLolZDIv8mJtXbKRobno3PyJPjTqWFe1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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