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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7d98660042d46480606b042df05c62ac5fd87cab9a58a56da5f523277658b6b' 
  AND token = 'bNPwsC8RVw/07lztVRatOfiEOgd/pBUyHX/o4ABrKfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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