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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82bc6810f550f57aa8aea192a085eea55fc8833b7d976b5c2b44ee1b9d51ce6f' 
  AND token = 'NBYTeF86ZC2z04t6iZxIUpoZA2PPRACb4O9jo/FdgqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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