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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '605032845fdb79fab445998518f0e331f88a530e1936fe3f6abc08a66ccd4001' 
  AND token = 'w7i/SJBuw8XuUtdEGsNGyoPt2M/BuCda6wgA1kw5dl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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