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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038e8a34d72de96a518682959b19b5666d64cf9dd51b3db6510ed8f3880e3d4d' 
  AND token = '6DzdJCsHxg4LFsrWYS7kXaZXTL4Enq7PP42bXZbeIMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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