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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c34498a104b4f6fcd84b28898420118c5475d28d9fb1b052cc5ade54ced8b7dd' 
  AND token = 'BEQUAcNviFubJxXTFu2sYm/nE8pdQMox1/CpQIlsax4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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