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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1680b223eda404cf7137d82cdb5bdd80708ce8f3b902a1c657e72ddf983a2553' 
  AND token = 'i2hEIx1tGma25viS25fQQvucbScP37c9muPTyZNe+oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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