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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d2175c07e1bf32d8272e16e8fec68981e9778bc651c1d605933b270bdef43e3' 
  AND token = 'pMuwXSnCKHpYOe2kzygLk3/C0OajhLAKObt458Ao8eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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