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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c15b92167704d2ab4300f7f73a40fe2fb9dee6105b80a52c4fb02aaeec6d04' 
  AND token = 'sNODN6Q+/bkXcwYwR+Je/nWw70wNYpOF1CM7vMFp+Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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