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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '301da4bd1a3abafd51f79bf76af0844fa7674bb5c23ed782cbc074838ca8fc4c' 
  AND token = 'jvz9p4iqg+Wz0DHl1eFPL2vw1Y0kO+j8hhWq7Wxwsc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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