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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c0098832f8e04da5c8ff62f5d776f033875efd38788ea419321e0d35c93eef9' 
  AND token = 'RQcLrjLUdluwBxJOVZGDmcNnr2GXkKc/0GWP5lEBPT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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