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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3129093a5b978e0039d0cdd2b6ebf0804d0f067c350b4131961ab7c130ca874' 
  AND token = '6E9e9D7j6Evm481WRU7s/bNprasLCS18y86zRQ2B/7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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