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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b58437c991828d48e612a1486418ad3f3871f0be30dd46fb7689284d8fa288d' 
  AND token = 'ak2AzHgMFNCrxks3W1R+yWAKgcjbegF89IXoZScvwZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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