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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b88131ca4d91a9b63eb79687535d591815781721cc89d0cdabd2df2810b4fe75' 
  AND token = 'SuTC7zbrwRnNu5c5iUTizvC9N7KSgaOTnZQLViE4WMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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