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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0683e0638f54c5148ec09ea2c76e213a23a7558daa35ab76a17472e0bf00edeb' 
  AND token = 'f2ULRwdEGPmQg67DOYpjcKATHKKb7eXnUotIl273w40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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