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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3509bf51fc44674b61f3504f64468236874f4126c4c32c06f25e2c611ad4d192' 
  AND token = 'lOLR5l7rZe8RcUIuPj0tn3CXK0vhnH9kxHW0l00M3j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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