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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a819e9dfd240fb5253fc2dbc3f4229f5dd5dbc9209a483d27d7ba47cdad21b2a' 
  AND token = 'v4mZT2SnVco+BbEiQEUi/Z8U6g0Yk/fqxO4Z1o8XcH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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