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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d6ec2cbe6551c5fb3fe65dd57756ae732b75475b2d6e5c6583151c52aae9fc2' 
  AND token = 'aMrkzzZsSaJeMYQWpt+kUr1Ov5mHJzmzxj7I5EgFv5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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