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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8b0df3ffd0aae294b4697219f368b02a51a54fb268c13cd736e33ebe8dd893c' 
  AND token = 'U85juUQeXTGuaCAN6R957fUAh+0woJg/BvGa0WJOQIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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