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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0503712d197e6c1cf1d5cdac53d63a99e03a010c9a41b6f1e0c76582a7f7c27' 
  AND token = 'tWOvkGHse3duAHnjzF7Aqzg1BWiRuCcdWy4y+6VHQ5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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