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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '378a3430be6c8b0e52a8d5131f048bef732eabeef52833bea032a2c066155c4b' 
  AND token = 'iDNjCbLQ7+E8rLZEZeMAs8exxQuGi0CO0fICSABfxhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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