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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1236c837df744fab20b2afe52a6ac86f736c9c14c5bf3e81c07bb3d1446446ee' 
  AND token = 'FkK4LTV7EXPhS9t7yBMlkXPihuspmgBOAlapbsXHKOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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