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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cd6a334473afd06f07339044aee4cab7b3ce20c2497157eface1440b50117c4' 
  AND token = 'kiTgOyX5jj9f67Wu8etWZYBd1Q/c3LpoaRaY1qfw46M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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