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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8bc926a74ec227b9e3fa1df5da6fa42329945701d5483af370ca5cba944d923' 
  AND token = 'WtkglAt1F/f5jWmtE0Rv4M0kufyIjad1DFS9/7m8fUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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