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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '311d5a4db5fa974ba89dc095e8625f1b66eecad2b1fa021a0a74f9d03ac4ef5e' 
  AND token = 'Q7sKeKDpBAcOZ1etzWnsAjE05iUiPuVt8UsD3SQDAag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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