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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f70c357ebec26d3522920e1b8c122d256a7a9619228bd98a70f8ae3d8fed69e' 
  AND token = 'Dsh+XPBHp8QN5z6zRiML8tfnhP9CsUujKORds632gHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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