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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c47aa84e7630143af83f93f35ea789fe40c0015a8b0318b61d092674a7b39e5' 
  AND token = 'Fj9byy1mkaPlMo1aZhXuNSTM3haQVjUbjn8/RNQ0UtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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