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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19017bae7754409a553bf8a71252c0cad334233a4c20d575fd3f68970373933f' 
  AND token = 'zQQRZI15vSMTFGyL6Zdv84ffg/p87NX9FU8bbsx3pQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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