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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ebdae64396965be4899d39ec2a57ce4717ef6699aaf9aec19cc8c5e2bd35a7' 
  AND token = 'EYrQ9ihBb5LqpsCa0x9S7INoaINmYZ+FJI/f22obYRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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