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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af1407f9d6fd9ef3181927e74249f2747f8d7e917722ebbac1e7141d12ffa04' 
  AND token = 'X8uSs+FvQTMvXKtmLGcdysJpfIUIVFHXpqXJDvFzGvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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