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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93849dfcdbcdb433344672d4c3a6176e6fb0a7a68ba88f243d751b8d732f533a' 
  AND token = 'x6syCUxqqxfqWrjd81HZkX+Px9EPc7rSxVdgxdsUxjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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