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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '789f7f379f4be54a06c48e557823076d8866b3e84e59a681b058f1da8ca565ff' 
  AND token = '0Q04oHRaF/yH9bFF3VxfKRm3BMEP00XndvtnjOf5ubw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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