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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67a96e07a11dbf773c67fcde59d80de07d3022fa4e77c13aaa82ed71462e92be' 
  AND token = 'NessxBE+RBZdeBvDfYoFoCd2IIJTS9ejJLPY6rFZ/8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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