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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16b3cfcbd191cbf2ee004948d7526393ae01a1a5d5d3bdd4e1bf012b10bbe42c' 
  AND token = 'Bv7jOqGkb8VBE451qWNkQS+dzj7/rhzd3wfFNpr51RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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