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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24072d3380eb11d6ded15e137bd60d55803fb7641baaf5488556018246be8d79' 
  AND token = 'h/0f1YVUJWoDpW1L9c+/7cOFGuxfHWT//y1rTPV6YIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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