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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a8e2f8d4a687c2b8db9d0295a452863ee8b58dc6d84398c2e7da580bfb3c7b7' 
  AND token = 'hyp0Qdk6au4ohX8x34kXdTa48d4cTpt+QIlz80z2eIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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