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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c30a94d1a1d9b8e206ae608a18e895af9e9af1a26c7f182efa70bbf793b5f31' 
  AND token = 'jqaS3pdD4YE6dLhPJTVhKKH+qJJIvQP0iktYyOj+4c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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