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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4fa9dfd68490e0ba57917f37bad84dcc66be9658f9224b46731a0ffdbf60ec8' 
  AND token = 'YSTV29KfqgwlvXvdiA363KVpTom1hK00CO601m6EP70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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