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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dce1136a54db937839f0ed7bfea6ebdc117cc97373b643b0897f217c4a284ae' 
  AND token = 'qH5IqK/rEZYp94C0xC4u235M2PFDQPK5flVDPfP90F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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