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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6126c2dd0e18be29781ae260e22a70d291e0935ba829bc17a01b40278f08ede9' 
  AND token = 'h/nQOhT7bpHrkE2NsNQodMTOHOYvaT5dpmkG6982PtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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