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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b23f6ca8f3c819daae9d7f5edb480b541c13d4b15713103b33ad2a812afb765' 
  AND token = '6/XjRbP9lRbwVhg0SnMxnN1wXsAwbBToFwU8ivE1+xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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